2026 ICD-10-CM Diagnosis Code T82.391AOther mechanical complication of carotid arterial graft (bypass), initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T82

ICD-10-CM T82.391A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T82.391A is a billable ICD-10-CM diagnosis code for other mechanical complication of carotid arterial graft (bypass), initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of cardiovascular device, implant or graft, initial encounter.

Code Identity

ICD-10-CM Code
T82.391A
Billable Status
Yes — Valid for Submission
Code Describes
Other mechanical complication of carotid arterial graft (bypass), initial encounter
Short Description
Mech compl of carotid arterial graft (bypass), init encntr
Parent Code
T82.391
Other mechanical complication of carotid arterial graft (bypass)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT82Complications of cardiac and vascular prosthetic devices, implants and grafts
This CodeT82.391AOther mechanical complication of carotid arterial graft (bypass), initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of cardiac and vascular prosthetic devices, implants and grafts (T82). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ033
Complication of cardiovascular device, implant or graft, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert T82.391A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
996.1 Malfunc vasc device/graf
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T82.391AOverview

Is T82.391A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other mechanical complication of carotid arterial graft (bypass), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T82.391A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other mechanical complication of carotid arterial graft (bypass), such as an emergency visit or first evaluation.

What MS-DRG does T82.391A group to?

When other mechanical complication of carotid arterial graft (bypass), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T82.391A?

Under the General Equivalence Mappings, other mechanical complication of carotid arterial graft (bypass), initial encounter converts to ICD-9-CM 996.1 (malfunc vasc device/graf). The mapping is approximate, so confirm the match fits the documentation.